Along with the FAQs, the TSR Welcome Pack should help you to get started with the site, though feel free to ask if anything's unclear. As for getting a sub, one of the biggest benefits is the lack of adverts on the site which makes IMO makes quite a substantial difference. The full package details are here, and if you're tempted then you could try for a month to see what you think; you're free to cancel whenever you like. Whatever you decide, happy posting!